Carebara lithophila

Quick Summary

• Difficulty: Unknown, newly described species
• Origin & Habitat: Yonaguni-jima, Yaeyama Islands, Southern Ryukyu Islands, Japan. Found nesting under a large stone in a subtropical island environment ^[7][1].
• Colony Type: Unconfirmed, colony structure has not been documented for this newly described species.
• Size & Growth:
  • Queen: Not yet documented, this species was only described in 2025 and queen specimens have not been collected or described.
  • Worker: Major workers: 2.5-2.7mm total length. Minor workers: 0.85-1.00mm total length ^[2][4].
  • Colony: Unknown, no wild colony size data exists for this newly described species.
  • Growth: Unknown, development timeline has not been studied.
  • Development: Unknown, this is a newly described species with no published development data. (No direct measurements exist for this species.)
• Antkeeping:
  • Temperature: Inferred from habitat: Southern Ryukyu Islands are subtropical with warm temperatures year-round. Start around 24-28°C and observe colony activity.
  • Humidity: Inferred from nesting under stones in a subtropical island: likely prefers moderate to slightly elevated humidity. Keep the nest substrate consistently moist but not waterlogged.
  • Diapause: Unknown, no seasonal data exists for this species. The Southern Ryukyu Islands have mild winters, so a true diapause may not be required.
  • Nesting: Natural nesting: found under a stone in soil ^[7][1]. In captivity, a small test tube setup or a small naturalistic nest would work well given their tiny size.
• Behavior: Not documented in captivity yet. Based on genus-level Carebara behavior, these are likely docile, non-aggressive ants that forage individually for small prey. Their extremely small size means escape prevention is critical, they can squeeze through tiny gaps. Major workers have the distinctive horned appearance but their defensive behavior follows the Myrmicinae subfamily pattern of smearing venom rather than piercing. Expect them to be shy and non-confrontational given their tiny colony sizes and small individual stature.
• Common Issues: newly described species means no established care protocols, you will be pioneering captive husbandry, tiny size makes escape prevention challenging, use fine mesh and tight-fitting barriers, no colony size data makes it difficult to know what to expect as the colony grows, queen has not been documented or described, wild-collected colonies may be difficult to obtain, no known dietary preferences, start with standard ant foods and observe acceptance

Discovery and Identification

Carebara lithophila was only described in 2025, making it one of the most recently discovered ant species available to hobbyists. Researchers collected the type colony from under a large stone on Yonaguni-jima, the westernmost inhabited island of Japan ^[7][1]. The species name 'lithophila' directly references this stone-nesting behavior. The major workers are distinctive among Japanese Carebara species because they have a pair of large horns on the head connected by a complete transverse carina, no other Japanese species in this genus has this feature ^[6]. The minor workers are much smaller and entirely yellow, making them nearly invisible to the naked eye. This species is most similar to Carebara sakamotoi from Taiwan and Carebara bihornata from China, but can be distinguished by several morphological features including the horn structure, eye size, and body sculpturing ^[8][9].

Housing and Nest Setup

Given their tiny size and recent discovery, there are no established captive protocols for Carebara lithophila. Base your setup on what is known: they were found nesting under a stone in soil, suggesting they need a compact nest with moist substrate. A small test tube setup works well for founding colonies, use a small water reservoir with cotton, keeping the tube horizontal so the queen can choose her humidity level. For established colonies, a small naturalistic setup with a small chamber filled with fine soil would be appropriate. The key is scale: their minor workers are under 1mm, so chambers should be small and passages narrow. Escape prevention is critical, these tiny ants can squeeze through gaps that seem impossible. Use fine mesh on any ventilation holes and ensure all connections are sealed. A layer of fluon on the inner rim of the outworld helps prevent escapes.

Feeding and Diet

Dietary preferences have not been documented for this species. Based on typical Carebara genus behavior, they likely forage for small insects, aphid honeydew, and other tiny food sources. Start with standard ant foods: a sugar source (honey water or sugar water) and protein sources like small insects (fruit flies, pinhead crickets, mealworms). Given their minute size, prey items should be very small, wingless fruit flies are an excellent choice. Many Carebara species are considered 'thief ants' because they can infiltrate other ant nests to steal brood or food, but this behavior has not been documented for C. lithophila. Offer food in very small quantities and remove uneaten items to prevent mold. Monitor what the colony accepts and adjust accordingly.

Temperature and Seasonal Care

The Southern Ryukyu Islands where this species originates have a subtropical climate with warm temperatures year-round. Winters are mild, with average temperatures remaining above 15°C. Start with a temperature range of 24-28°C and observe your colony's behavior. If workers become sluggish and cluster together, the colony may benefit from slight warming. If they avoid heated areas of the nest, reduce temperature. Unlike temperate species, a true hibernation diapause is likely not required, the mild Ryukyu winters mean they may simply reduce activity rather than enter deep dormancy. Monitor their activity levels during winter months and adjust heating accordingly. A small heating cable on one side of the nest can create a temperature gradient, allowing the ants to self-regulate.

Defense Mechanism

Carebara lithophila belongs to the subfamily Myrmicinae and tribe Crematogastrini. Members of this tribe typically have a modified, flattened stinger used to wipe or smear venom onto enemies rather than piercing flesh. This smear defense is characteristic of many Crematogastrini ants and is considered the default defense mechanism for this species in the absence of specific documented observations.

What We Don't Know

This is perhaps the most important section for prospective keepers: Carebara lithophila was only described in 2025, and almost nothing is known about its biology in captivity or the wild. We don't know the queen size or appearance, colony structure (single queen or multiple), founding behavior, development time, dietary preferences, or overwintering requirements. Every observation you make as a keeper contributes to our knowledge of this species. Be prepared to experiment with care protocols and document your findings. Start with reasonable assumptions based on related Carebara species and the subtropical island habitat, but be ready to adjust based on how your colony responds. This is an opportunity to be a pioneer in understanding this newly discovered species.

Frequently Asked Questions

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References